Interconnected remote control lighting system

ABSTRACT

Systems, methods, and computer program products for providing and managing a lighting system. A lighting device of the system is configured to receive an activation signal from a user interface of the lighting device, an external communication device, or another lighting device. In response to receiving the activation signal, and if certain operational conditions are met, the lighting device may activate a light source and transmit another activation signal. Additional lighting devices receiving the activation signal from the first lighting device may also activate their light sources and retransmit the activation signal. Data carried by the activation signals and signals received from one or more sensors in each lighting device may be used by the lighting device to determine whether to activate its light source, and one or more characteristics of the light to be emitted.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the filing benefit of U.S. Application No.62/856,191, filed on Jun. 3, 2019, and entitled “Interconnected RemoteControl Lighting System”, the disclosure of which is incorporated byreference herein in its entirety.

FIELD OF THE INVENTION

This invention generally relates to lighting systems and, in particular,to systems, methods, and computer program products for controllingoperation of a group of lighting devices.

BACKGROUND OF THE INVENTION

Lighting systems, and in particular outdoor lighting systems, cangreatly enhance both the appearance and safety of areas used fornighttime activities. However, planning and installing lighting systemsthat receive power from a utility and cover large areas can beexpensive. These types of systems typically require significant amountsof time and technical expertise to design and install, and requireinspections and permits from local authorities before they can becommissioned. Moreover, these systems lack flexibility. Once the systemis installed, any changes needed to adjust the distribution of light inthe area being lit can require further significant expenditures of timeand money.

Thus, there is a need for improved systems, methods, and computerprogram products that provide lighting systems which are easy toinstall, operate, and modify.

SUMMARY OF THE INVENTION

In an embodiment of the invention, a system is provided that includes afirst lighting device and a second lighting device. Each lighting deviceincludes a processor, memory including program code, and a light source.The program code of the first lighting device, when executed by itsprocessor, causes the first lighting device to receive a first signal,and, in response to receiving the first signal, activate its lightsource and transmit a second signal. The program code of the secondlighting device, when executed by its processor, causes the secondlighting device to receive the second signal, and, in response toreceiving the second signal, activate its light source.

In another embodiment of the invention, a method is provided. The methodincludes receiving the first signal at the first lighting device, and inresponse to receiving the first signal, activating its light source andtransmitting the second signal from the first lighting device. Themethod further includes receiving the second signal at the secondlighting device, and, in response to receiving the second signalactivating the light source of the second lighting device.

In another embodiment of the invention, a computer program product isprovided. The computer program product includes a non-transitorycomputer-readable storage medium, and program code stored on thenon-transitory computer-readable storage medium. The program code isconfigured so that, when executed by one or more processors, the programcode causes the one or more processors to receive the first signal atthe first lighting device, and in response to receiving the firstsignal, activate the light source of the first lighting device andtransmit the second signal from the first lighting device. The programcode further causes the one or more processors to receive the secondsignal at the second lighting device, and, in response to receiving thesecond signal, activate the light source of the second lighting device.

The above summary presents a simplified overview of some embodiments ofthe invention to provide a basic understanding of certain aspects of theinvention discussed herein. The summary is not intended to provide anextensive overview of the invention, nor is it intended to identify anykey or critical elements, or delineate the scope of the invention. Thesole purpose of the summary is merely to present some concepts in asimplified form as an introduction to the detailed description presentedbelow.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate various embodiments of theinvention and, together with the general description of the inventiongiven above, and the detailed description of the embodiments givenbelow, serve to explain the embodiments of the invention.

FIG. 1 is a diagrammatic view of a lighting system including a pluralityof lighting devices.

FIG. 2 is a diagrammatic view depicting certain electrical features ofan exemplary embodiment of the lighting devices of FIG. 1 .

FIG. 3 is an isometric view depicting certain mechanical features of anexemplary embodiment of the lighting devices of FIG. 1 .

FIG. 4 is an exploded view depicting certain mechanical features ofanother exemplary embodiment of the lighting devices of FIG. 1 .

FIG. 5 is an isometric view of the lighting device of FIG. 4 .

FIG. 6 is a cross-sectional view of the lighting device of FIGS. 4 and 5.

FIG. 7 is a flow chart illustrating a process that may be implemented bythe lighting system of FIG. 1 .

FIG. 8 is a diagrammatic view of an exemplary operating environment forthe lighting system of FIG. 1 .

FIG. 9 is a diagrammatic view of a computer that may be used toimplement one or more of the components or processes shown in FIGS. 1-8.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 depicts an exemplary lighting system 10 in accordance with anembodiment of the present invention. The lighting system 10 includes aplurality of lighting devices 12 and a communication device 14. Eachlighting device 12 may be configured to receive and transmit signals 16(e.g., wireless signals) that carry data using a suitable communicationprotocol. Exemplary communication protocols may include, but are notlimited to, Bluetooth®, Bluetooth Low Energy (BLE), Radio FrequencyIdentification (RFID), Near-Field Communication (NFC), Wi-Fi®, Ethernet,Universal Serial Bus (USB), or the like. The lighting devices 12 may beconfigured to be placed anywhere additional light is desired, such as onthe ground along a path.

Data carried by the signals 16 may include one or more identifiers, suchas a universally unique identifier (UUID), a medium access control (MAC)address, Internet Protocol (IP) address, or any other suitableidentifier that can be used to uniquely identify a lighting device 12 orcommunication device 14. Identifiers carried by a signal 16 may includeone or more of the identifier of the device that originally transmittedthe signal 16 (the “originating device”), the identifier of one or moredevices through which the signal 16 has passed (“relaying devices”), andthe identifier of the device that transmitted the signal 16 beingreceived (the “transmitting device”).

The communication device 14 may be a smart phone, tablet computer,desktop computer, network access point, or any other suitablecommunication device, and may include a system management application.The system management application may enable a user to control thelighting devices 12 by transmitting and receiving signals 16. The systemmanagement application may be downloaded to the communication device 14,for example, from a digital distribution platform, such as amanufacturer website or online vendor, such as the APP STORE®, which isa digital distribution platform for computer software operated by AppleInc. of Cupertino Calif. The communication device 14 may alsocommunicate with a network 18 (e.g., a service provider network), andmay transmit signals 16 in response to messages received through thenetwork 18. The communication device 14 may thereby enable users toconfigure and control the lighting system 10 remotely, e.g., over theInternet.

The system management application may control the lighting devices 12 indifferent ways depending on input from the user. For example, inresponse to the user activating an “all lights on” feature, the systemmanagement application may broadcast a signal 16 that activates alllighting devices 12 the communication device 14 is authorized toactivate and that are within range of the communication device 14. Inresponse to receiving this signal 16, a lighting device 12 may activatea light source that causes the lighting device 12 to emit light. Thelighting device 12 may also rebroadcast the signal 16. Rebroadcastingthe signal 16 may enable other lighting devices 12 of lighting system 10to be activated that are out of range of the signal 16 transmitted bythe communication device 14, but within range of the lighting device 12rebroadcasting the signal 16. The rebroadcast signal 16 may carry all orpart of the data carried by the received signal 16, and may also carryadditional data added by the lighting device 12, such as the identifierof the transmitting lighting device 12.

Each lighting device 12 may also be activated directly by the user,e.g., by the user stepping on or otherwise interacting with the lightingdevice 12. In response to being directly activated, the lighting device12 may transmit a signal 16 that activates nearby lighting devices 12 ina similar manner as described above. This activation signal 16 maypropagate through the plurality of lighting devices 12 until all thelighting devices 12 in a defined group of lighting devices 12 areilluminated. Other exemplary features that may be provided by the systemmanagement application include a time-on duration, light/dark threshold,color, intensity, alert, and bond device features.

The time-on feature may enable the user to set a duration that thelighting device 12 remains illuminated after being activated, either byan activation signal 16 or directly by a user. This duration may be setin the lighting device 12 itself (e.g., by the user during a set-upprocess), or may be set by data contained in the activation signal 16,in which case the duration could be varied each time the lighting device12 is activated by an activation signal 16.

The light/dark threshold feature may enable lighting devices 12 toignore activation signals during periods when the ambient light is abovea threshold light level. This feature may enable the lighting devices 12to conserve power during daylight or twilight hours. This feature mayalso enable the user to adjust the level of ambient light above whichthe lighting device 12 ignores activation signals. The user may therebydetermine how dark it should be before the lighting device 12 switcheson in response to being activated.

The color feature may enable the user to select a spectral content orcolor of light that is emitted by the lighting device 12. The color maybe selected, for example, by the user entering a correlated colortemperature (CCT), selecting a color from a chromaticity chart, or anyother suitable interaction with a user interface of the communicationdevice 14. The color may be set individually for each lighting device 12(e.g., by setting a parameter in a memory of the lighting device 12 thatcontrols the light output by the device), or may be selected for alllighting devices 12 (e.g., by including a color parameter in theactivation signal 16 that controls the light output by the lightingdevice 12 or resets the stored color parameter at the lighting device12).

The intensity feature may operate in a similar manner as the colorfeature by setting a parameter that controls the intensity of thelighting device 12. The intensity parameter may be stored in thelighting device 12 or be encoded in the activation signal 16. Theintensity may be set to an absolute value (e.g., 800 lumens), or arelative level that varies with the ambient light level to optimizelight output to the ambient conditions.

Activation of the alert feature may cause all lighting devices 12receiving the activation signal 16 to illuminate themselves immediately.The lighting devices 12 may also begin flashing in a predetermined,customizable alert color and intensity. Lighting devices 12 receiving analert signal may also forward this signal to other lighting devices 12.The alert feature may thereby allow users to capture the attention ofothers in the event of an emergency.

The bonding feature may enable the user to configure the lighting device12 so that it only responds to signals 16 from other lighting devices 12or communication devices 14 to which it is bonded. The bonding featuremay prevent lighting devices 12 from responding to signals 16 fromunrecognized devices, such as a communication device 14 or lightingdevice 12 of a neighboring lighting system 10. Bonding may beaccomplished using a pairing process. This pairing process may beinitiated by a request from a user to generate a bond (e.g., by scanningfor and requesting a lighting device 12 be bonded to the communicationdevice 14), or may be triggered automatically when the user provides aninput to a lighting device 12 indicating that a nearby device istransmitting a bonding signal.

In response to being bonded with another device, the bonded lightingdevice 12 may begin responding to signals 16 transmitted from thatdevice. The bonding feature may enable the user to configure lightingdevices 12 so that they only respond to signals 16 transmitted fromspecific devices. In response to receiving a signal 16, a bondedlighting device 12 may attempt to determine the identity of the deviceoriginating, relaying, or transmitting the signal 16 by extracting oneor more identifiers from received signal 16. The lighting device 12 maycompare any identifiers in the signal 16 to identifiers of devices towhich it is bonded, and respond to the signal 16 based on the results ofthe comparison.

How the lighting device 12 responds to receiving a signal 16 from abonded device may depend at least in part on the identity of the device.For example, the color or intensity of light emitted by the lightingdevice 12 receiving the signal 16 may vary depending on one or more ofthe identities of the devices originating, relaying, or transmitting theactivation signal 16. The response may also vary depending on the timeof day (e.g., activate the light source at a reduced intensity betweenmidnight and 5 AM) or ambient conditions sensed by the lighting device12 (e.g., only activate light source if the ambient light level is belowthe threshold light level).

The system management application running on communication device 14 maycommunicate instructions to any lighting device 12 that is in range andto which the communication device 14 is bonded. The system managementapplication may also communicate to or through other communicationdevices 14, either directly or over a network. The ability of the systemmanagement application to communicate with other communication devices14 may allow users to control lighting devices 12 over the Internet, forexample.

FIG. 2 depicts an exemplary lighting device 12 including a controller 20in communication with an input/output interface 22, a light source 24,an ambient sensor 26, a user interface 28, and a power supply 30. Thepower supply 30 may include an energy source 32, an energy storagedevice 34, and an energy management module 36. The energy source 32 mayinclude an energy harvesting device (e.g., a solar cell or otherphotovoltaic device), an external source of electrical power (e.g., aconnection to an AC adapter or Power over Ethernet), or any othersuitable source of energy. For example, the energy source 32 may includea solar panel comprising one or more photovoltaic or photoelectriccells, such as a 6-volt solar panel available from PowerFilm Inc. ofAmes Iowa.

The energy storage device 34 may include one or more electrochemicalcells, capacitors, or the like, and may be configured to store energyprovided by the energy source 32 during times of excess capacity. Onesuitable energy storage device 34 may include a lithium ion batteryhaving a 3.7 volt output and a 1,200 milliamp hour capacity.

The energy stored in the energy storage device 34 may be used by thelighting device 12 when the energy source 32 is unable to meet demand,e.g., at night in the case of a solar cell-based energy source 32 orduring a power outage in the case of an external energy source. Theenergy management module 36 may manage energy transfer between theenergy source 32, energy storage device 34, and the energy consumingcomponents of the lighting device 12, such as the controller 20, I/Ointerface 22, and light source 24. The energy storage device 34 may beconfigured to provide all required power to operate the components ofthe lighting device 12 during periods of time when the energy source 32is unable to meet the energy demand of the lighting device 12.

The controller 20 of lighting device 12 may be configured to receive andtransmit signals 16 through the I/O interface 22 and control the outputof the light source 24. The controller 20 may execute embedded programcode comprising a controller application that causes the controller 20to monitor input conditions and take predetermined actions basedthereon. The controller application may be implemented as a perpetualevent loop that spends most of its time hibernating to conserveelectrical power. Whenever a prescribed interval of time passes, thecontroller application may cause the controller 20 to wake up, power upa transceiver in the I/O interface 22, and check for incoming signals 16to determine whether any devices within range are broadcasting a signal16 to which the lighting device 12 should respond.

Control of the light source 24 may be based on signals 16 received fromother devices, signals from the ambient sensor 26, signals received fromthe user interface 28, as well as the operating conditions and controlsettings of the lighting device 12. To determine operating conditions,the controller 20 may be configured to monitor one or more of theambient sensor 26, user interface 28, and energy source 32. For example,to determine an ambient light level, the controller 20 may monitor avoltage output by the ambient sensor 26 or (for embodiments using asolar panel) a terminal (e.g., the positive terminal in a negativeground system) of the energy source 32. This voltage may be measured bysampling the voltage across a resistive element, e.g., two 100,000-ohmresistors connected in series between the voltage source and ground. Theuser interface 28 may include a touch sensor, pressure sensor, switch,proximity sensor, motion sensor, microphone, or other device thatgenerates an internal activation signal when activated by a user, e.g.,by stepping on the lighting device 12. The controller 20 may alsoprovide power to and communicate bidirectionally with the transceiver ofthe I/O interface 22.

The controller 20 may receive a constant voltage (e.g., a three-volt DCvoltage) from the energy management module 36, which may have abidirectional power connection with the energy storage device 34. Tocharge the energy storage device 34, the energy management module 36 mayreceive power via one or more conductors (e.g., two conductors) from theenergy source 32 and, during times of excess power generation, provideat least a portion of this power to the energy storage device 34. In anembodiment of the invention, the energy management module 36 may includea charge management controller, such as an MCP73811 available fromMicrochip Technology Inc. of Chandler, Ariz.

The I/O interface 22 of lighting device 12 may include theaforementioned transceiver or other circuitry that enables thecontroller 20 to transmit and receive signals 16. The I/O interface 22may thereby enable communication between lighting devices 12 andcommunication devices 14 within range of each other using wirelesssignals, e.g., Bluetooth®, BLE, RFID, NFC, or Wi-Fi® signals. The I/Ointerface 22 may also include a data port (e.g., a serial data port suchas an Ethernet or USB port) or other physical connection that enablesthe lighting device 12 to be connected to other lighting devices 12 orthe communication device 14 through a cable. The I/O interface 22 mayenable lighting devices 12 to communicate with each other to form anad-hoc network, and to coordinate responses to signals 16 received froma system management application running on one or more communicationdevices 14. This communication may further enable the system managementapplication to update the configuration and control operation of eachlighting device 12 within the lighting system 10.

Updates to software/firmware may be issued periodically by the systemsupplier, e.g., when the supplier determines an update is likely toimprove operation of the lighting system 10. To initiate an update, thesupplier may send a notification to registered users of lighting devices12. This notification may comprise an electronic message that istransmitted to one or more communication devices 14 associated with theuser. The electronic message may be an email, text message, or othersuitable communication medium, and may include instructions on how toupdate the lighting device 12. For example, the instructions mayinstruct the user to update the lighting device 12 using a boot loaderoption that loads program code stored in a memory of lighting device 12in response to rebooting lighting device 12.

The electronic message may include program code embedded as a file inthe message, or a link to a location from which the program code can bedownloaded. The location from which the program code can be downloadedmay be a secure part of a web page provided by the supplier, and may beaccessed using a link embedded in the electronic message. Under thisscenario, users may open the secure area by clicking on the link in theelectronic message, and accept a request to download the program codedisplayed by the communication device 14 in response to entering thesecure area.

The program code may be downloaded directly to the lighting device 12,or through the communication device 14 of the user. For example, theprogram code may be transmitted to the lighting device 12 using a securedata stream to one or more lighting devices 12 in the lighting system10, e.g., using a Bluetooth or Wi-Fi signal. In response to receivingthe update signal, the lighting device 12 may store the program code ina local memory. The lighting device 12 receiving the update signal mayalso wake adjacent lighting devices 12 so that they can receive theupdate signal, either directly or through another lighting device 12that relays the update signal. For lighting systems 10 that includemultiple lighting devices 12 which need to be updated, the update may beperformed after all the lighting devices 12 in the lighting system 10are awake and have received the program code. Updates may be timed tooccur when the lighting device 12 is unlikely to be activated, such aswhen detected ambient light levels are consistent with daylight.

The light source 24 may include one or more electric lights, such aslight emitting diodes (LED). For example, the light source 24 mayinclude a plurality of LEDs including one or more LEDs having differentoutput spectrums or intensities. This may enable the controller 20 tocontrol one or more characteristics of the light output by the lightingdevice 12 (e.g., color, compensated color temperature (CCT), intensity,etc.) by independently adjusting an amount of power provided to each LEDof light source 24.

The ambient sensor 26 may provide a signal to the controller 20indicative of an ambient condition, such as ambient light level, soundlevel, movement, temperature, or an image or video of an area in view ofthe lighting device 12. The audio, video, temperature, or otherenvironmental data received from the ambient sensor 26 may be storedlocally for later retrieval or transmitted as telemetry embedded in asignal 16. The controller 20 may also use this data to turn the lightsource 24 on or off or otherwise adjust the characteristics of the lightemitted by the light source 24.

For example, the controller 20 may set an intensity or color of thelight source 24 based on ambient light levels (e.g., turning off thelight in the daytime), motion proximate to the lighting device 12 (e.g.,a person approaching the lighting device 12), in response to detectingcertain sounds (e.g., breaking glass, a snapping twig, splashing, or avoice command), or temperature (e.g., changing color to indicate whetherit is warm or cold out). For embodiments in which the energy source 32includes a solar panel, the controller 20 may be configured to determineambient light levels based on the output of the energy source 32, inwhich case an ambient sensor 26 may be omitted or only configured toprovide signals indicative of conditions other than ambient lightlevels.

In an embodiment of the present invention, the ambient sensor 26 mayinclude a sensing device configured to detect activity associated with aswimming pool. The sensing device may include a transducer configured todetect surface waves, changes in pressure below the surface of thewater, acoustic energy, or any other activity that could be indicativeof an event occurring in the pool. Events detected may include, forexample, something or someone falling into the pool.

The sensing device may be coupled to the lighting device 12 by a tether,and may communicate with the lighting device 12 by transmitting signalsto the lighting device 12, e.g., through the tether or wirelessly. Thetether may be configured so that, when deployed, the sensing deviceremains in position on or under the surface of the water proximate tothe lighting device 12. The sensing device may be configured to float ontop of the water of the pool for surface detection of events or may beconfigured to sink below the surface of the water for sub-surfacedetection of events.

Lighting devices 12 that utilize the tethered sensing device may beinstalled proximate to an edge of the pool, such as near an entry/exitpoint of the pool where the user desires light. In response to detectingan event, the lighting device 12 may emit light or sound that providesan alarm. This alarm may in turn notify nearby persons that the eventhas occurred. The lighting device 12 may also transmit wireless signalsthat, when received by other lighting devices 12 or the communicationdevice 14, cause the lighting devices 12 to emit light or sound thatspreads the alarm or the communication device 14 to provide anindication to the user that an event has been detected in the pool.Detection of an event in the pool may thereby cause all the lightingdevices 12 in the lighting system, and the communication device 14 ofthe user, to indicate the occurrence of the event.

The user interface 28 may include a switch or other touch-sensitivedevice that provides an indication to the controller 20 that someone hasactivated the lighting device 12, e.g., by stepping on the lightingdevice 12. The touch-sensitive device may include one or more forcesensitive resistors (e.g., two resistors) that are integrated into a topcover plate of the lighting device 12, and may be attached to anexterior base portion of lighting device 12.

The user interface 28 may also include an audio transducer (e.g., aspeaker) that enables the lighting device 12 to emit sound. The soundemitted by the lighting device 12 may be indicative of a condition ofthe device, and may be emitted to provide feedback to users interactingwith the lighting device 12. Sound may also be emitted by the lightingdevice 12 to enable persons to determine a relative location of thelighting device 12.

Sounds may be emitted in response to the lighting device 12 beingactivated, either by receiving a signal 16 from another lighting device12 or the communication device 14, or by someone directly activating thelighting device 12. By enabling a person to estimate the position of thelighting device 12 relative to themselves, the sound emitted by thelighting device 12 may enable a person with impaired vision (e.g., dueto a physical impairment, low ambient light levels, or because they havebeen swimming) to follow a path from one lighting device 12 to anotherby following the sound.

To improve the ability of a person following the sound to distinguishone lighting device 12 from another, the lighting devices 12 may delayrelaying a received signal 16, or delay emitting sound based on a numberof times the received signal 16 has been previously relayed. This maycause the sounds to be emitted in a sequence that guides the listenerdown the path defined by the lighting devices 12.

FIG. 3 depicts an exemplary lighting device 12 in accordance with anembodiment of the present invention. The illustrated lighting device 12includes a housing 38 having a base 40 and a frame 42. The base 40 andframe 42 may be made from any suitable material or combination ofmaterials. Suitable materials may include plastic (e.g., polyethyleneterephthalate (PETG) or acrylonitrile butadiene styrene (ABS)) and metal(e.g., steel or aluminum). The base 40 and frame 42 may define a maincompartment 44 and one or more peripheral compartments 46. The frame 42may provide a rigid structure that resists torsional, compressional, orother deformational forces that could otherwise deform the compartments44, 46 and damage the components of the lighting device 12.

The main compartment 44 may include an opening 48, a bottom surface 50,and one or more side surfaces 52. A solar panel 54 including one or morephotovoltaic or photoelectric cells may be mounted to the bottom surface50 to provide the energy source 32, and one or more light sources 24 maybe embedded in the side surfaces 52. A cover 56 comprising an opticallytranslucent or transparent material having a top surface 58, a bottomsurface 59, and side surfaces 60 may be configured to fit over theopening 48 of main compartment 44. When the cover 56 is in place overthe opening 48, at least a portion of the light emitted by the lightsources 24 may be incident on the side surfaces 60. This light may enterthe cover 56 through the side surfaces 60 and be transmitted outwardfrom the top surface 58.

A peripheral portion 62 of the frame 42 may surround the maincompartment 44 and extend upward by a height h (e.g., about onecentimeter) from the base 40, and may have a width w (e.g., about fourcentimeters) that extends outward from a perimeter of the opening 48 ofmain compartment 44. The peripheral compartments 46 may be located inthe peripheral portion 62 of frame 42, and may house the energy storagedevice 34 and one or more printed circuit boards. One or more conduitsmay connect the peripheral compartments 46 to each other and to the maincompartment 44 to provide a path for conductors that connect the variouscomponents of the lighting device 12.

By way of example, one peripheral compartment 46 may house the energystorage device 34. The energy storage device 34 may be connected to amain circuit board including the controller 20 in another peripheralcompartment 46 by a plurality of conductors, e.g. three conductors. Twoof these conductors may supply power to the main circuit board, and oneof the conductors may provide a signal from a temperature sensorembedded in the energy storage device 34. This temperature sensor mayenable the controller 20 or energy management module 36 to determine ifthe energy storage device 34 is overheating. The peripheral compartment46 containing the main circuit board may be located adjacent to thebattery compartment.

FIGS. 4-6 depict another exemplary lighting device 64 in accordance withan embodiment of the present invention. The illustrated lighting device64 includes a housing 66, one or more pressure sensors 68, a solar panel70, a filler panel 72, and a cable 74 including one or more conductorsconfigured to couple a main circuit board 76 to a lighting circuit board78. The lighting device 64 may also include circuit board covers 80, 82configured to cover the circuit boards 76, 78, a lens 84 that receiveslight from the lighting circuit board 78, and a top cover 86.

The housing 66 may include an outer perimeter 88 and an inner perimeter90. Each of the outer perimeter 88 and inner perimeter 90 may define apolygon (e.g., a rectangle) or closed curve (e.g., a circle or ellipse)shape having dimensions. In the depicted example, the outer perimeter 88is a rectangular polygon having a length dimension l₁ (e.g., about 690mm) and a width dimension w₁ (e.g., about 280 mm), and the innerperimeter 90 is a rectangular polygon having a length dimension l₂(e.g., about 570 mm) and a width dimension w₂ (e.g., about 230 mm). Thelength and width dimensions of the outer perimeter 88 may be larger thanthose of the inner perimeter 90, and the outer perimeter 88 may bedisplaced from the inner perimeter 90 by a height dimension h₁ (e.g., 13mm) to define an angled surface 92 that connects the outer perimeter 88to the inner perimeter 90.

A recessed portion of the housing 66 may define a horizontal ledge 94that projects inward from the inner perimeter 90 by one or more positiondependent width dimensions w₃, w₄ (e.g., about 20 mm and 50 mm). Theledge 94 may be recessed below the inner perimeter 90 by a heightdimension h₂ that is about the same as a thickness t of the top cover 86(e.g., about 4 mm). The pressure sensors 68 may be positioned on thehorizontal ledge 94 so that they support the top cover 86 when it isplaced in an opening 96 defined by the inner perimeter 90. The top cover86 may have a top surface 98, and may be made from a transparent ortranslucent material that transmits light received from the lens 84. Thetop cover 86 may be configured to transfer pressure applied to its topsurface 98 to the pressure sensors 68, such as in response to a personstepping on the top cover 86.

The housing 66 may include another recessed portion that defines acompartment 100 having a bottom surface 102 and an opening 104. Thecompartment 100 may be positioned so that the opening 104 defines aninner edge 106 of ledge 94, and may be configured to receive the solarpanel 70, filler panel 72, cable 74, main circuit board 76, lightingcircuit board 78, circuit board covers 80, 82, and lens 84. The solarpanel 70 may positioned on or attached to the bottom surface 102 ofcompartment 100. The solar panel 70 may be located horizontally by oneor more sidewalls 108 of compartment 100 and the filler panel 72, andlocated vertically by the bottom surface 102 of compartment 100 and oneor both of circuit board covers 80, 82.

The main circuit board 76 may include all or a portion of the electroniccomponents of the lighting device 64, e.g., the power supply 30, energysource 32, energy storage device 34, energy management module 36, etc.The lighting circuit board 78 may include one or more light sources 110that are electrically coupled to the main circuit board 76 by the cable74. The main circuit board 76 may also be electrically coupled to thepressure sensors 68 and solar panel 70. The main circuit board 76 mayactivate the light sources 110 in response to receiving an activationsignal from one or more of the pressure sensors 68, and may store energyreceived from the solar panel 70 in the energy storage device 34.

FIG. 7 depicts a flowchart illustrating a process 120 that may beimplemented by the controller 20 of lighting device 12 or any othersuitable computing device of lighting system 10. In block 122, theprocess 120 may determine if a sleep mode has been interrupted, e.g.,due to a sleep timer expiring or the occurrence of some other event thatinterrupts the sleep mode. Exemplary events that could interrupt sleepmode may include receiving a signal indicative of a user activating thelighting device 12 via the user interface 28 (e.g., by stepping on thelighting device 12), or receiving a signal from the ambient sensor 26 orenergy source 32 indicating a change in the ambient light level. If thesleep mode has not been interrupted (“NO” branch of decision block 122),the process 120 may proceed to block 124 and remain in sleep mode. Theprocess 120 may thereby keep the controller 20 in a perpetual event loopthat maintains the lighting device 12 in a low-power state most of thetime to conserve energy.

If the sleep mode has been interrupted (“YES” branch of decision block122), the process 120 may proceed to block 126 and wake up the lightingdevice 12. Waking up the lighting device 12 may include powering up atleast a portion of the controller 20 or I/O interface 22 to determine ifany signals 16 have been received from another device. The process 120may also check to see if any signals are being received from the ambientsensor 26, user interface 28, or power supply 30 that would indicate anevent has occurred which requires a response by the lighting device 12,such as activation of the lighting device 12 via the user interface 28.

If no signals have been received (“NO” branch of decision block 128),the process 120 may proceed to block 130, reset the sleep timer, andre-enter sleep mode. If a signal has been received (“YES” branch ofdecision block 128), the process 120 may proceed to block 132 anddetermine if the signal was received from another device, i.e., is an“external signal”. If the signal is not an external signal (“NO” branchof decision block 132), the process may proceed to block 134. This mayoccur, for example, if the signal was received from the ambient sensor26 or power supply 30, or due to direct activation of the lightingdevice 12 through the user interface 28.

If the signal is an external signal, such as a signal 16 from anotherdevice (“YES” branch of decision block 132), the process 120 may proceedto block 136 and extract data from the signal. The extracted data mayinclude one or more identifiers, commands, parameters, settings, or anyother data that may be used to manage the lighting system 10. This datamay define, for example, an on-time duration for the light source 24, aduration for rebroadcasting the signal 16, threshold light levels forturning on or turning off the light source 24, a spectral content of thelight to be emitted by the light source 24, an intensity of the light tobe emitted by the light source 24, an alert or bonding condition, or oneor more identities of lighting devices 12 that are to activate theirlight sources 24 in response to receiving the signal 16.

Parameters defined by the data may be used to control the response ofthe lighting device 12 to just the received signal 16 carrying the data,or may be used to update settings in the lighting device 12 so that theycontrol operation of the lighting device 12 in response to receivingother signals. In cases where the signal 16 includes one or moreidentifiers of lighting devices 12 which are to be lit, the receivinglighting device 12 may only activate its light source 24 if itsidentifier matches one of these identifiers. If the identifier of thereceiving lighting device 12 does not match any of the identifierscarried by the received signal 16, the lighting device 12 may ignore thesignal 16, or may relay the signal 16 without activating its lightsource 24.

In block 138, the process 120 may determine if the signal 16 wasreceived from an authorized device. This determination may be made, forexample, by comparing one or more identifiers carried by the signal 16to a list of authorized devices, e.g., devices included in the lightingsystem 10. Devices included in the lighting system 10 may include alldevices that have been bonded to the lighting device 12, or may bedefined by a list of devices selected by the user through interactionwith the communication device 14. If the signal 16 was not received froman authorized device (“NO” branch of decision block 138), the process120 may proceed to block 130, reset the sleep timer, and enter sleepmode. If the signal 16 was received from an authorized device (“YES”branch of decision block 138), the process 120 may proceed to block 134.

In block 134, the process 120 may set a light timer and transmit asignal 16 configured to activate any lighting devices 12 to which thepresent lighting device 12 is bonded or otherwise authorized tocommunicate. The transmitted signal 16 may include identifiers for oneor more of the originating device, transmitting device, and any relayingdevices.

The process 120 may proceed to block 140 and determine if the ambientlight level is below the threshold light level. If the ambient light isnot below the threshold light level (“NO” branch of decision block 140),the process 120 may proceed to block 144. Thus, if the ambient lightlevel is above the threshold light level, the lighting device 12 mayconserve energy by not activating the light source 24. If the ambientlight is below the threshold light level (“YES” branch of decision block140), the process 120 may proceed to block 142 and activate the lightsource 24 before proceeding to block 144. The process 120 may therebycause the lighting device 12 to activate the light source 24 if aphotocell of the ambient sensor 26 or energy source 32 indicates thatthe lighting device 12 is in a dark environment.

When activating the light source 24, the process 120 may also adjust thethreshold light level to provide hysteresis. This hysteresis may preventthe light source 24 from being repeatedly turned on and off when theambient light level is close to the initial threshold light level. In analternative embodiment of the invention, the process 120 may avoidstrobing by ignoring or adjusting ambient light level readings while thelight source 24 is active.

In block 144, the process 120 may determine if the lighting device 12has received a new signal from an authorized source. For example,another or duplicate signal that would cause the lighting device 12 toactivate its light source 24 if it was not already activated. If a newauthorized signal has been received (“YES” branch of decision block144), the process 120 may return to block 134 to reset the light timerand transmit another signal 16. If a new authorized signal has not beenreceived (“NO” branch of decision block 144), the process 120 mayproceed to block 146 and determine if the light timer has expired. Ifthe light timer has not expired (“NO” branch of decision block 146), theprocess 120 may proceed to block 144. Thus, the process 120 may remainin a light timer loop in which the light timer is reset each time anauthorized activation signal is received by the lighting device 12. Ifthe light timer has expired (“YES” branch of decision block 146), theprocess 120 may proceed to block 148 and deactivate the light source 24.The process may then proceed to block 130, reset the sleep timer, andenter sleep mode.

FIG. 8 depicts an exemplary operating environment 150 for the presentinvention that includes a house 152 connected to a boat dock 154 by apath 156. A plurality of lighting devices 12 are placed at intervalsalong the path 156. A person traveling from the house 152 to the boatdock 154, or exiting a boat at the boat dock 154, may step on one of thelighting devices 12 proximate to the point at which they step on theboat dock 154 or enter the path 156. In response to sensing the pressureprovided by the person stepping on the lighting device 12, the lightingdevice 12 may begin emitting light and may also transmit signals 16 thatare received by one or more of the other lighting devices 12. Inresponse to receiving these signals 16, the other lighting devices 12may also begin to emit light and transmit signals 16. This may result inall or a predefined portion of the lighting devices 12 emitting lightthat illuminates the path 156. The lighting devices 12 may therebyfacilitate the person traversing the path between the house 152 and boatdock 154.

Referring now to FIG. 9 , embodiments of the invention described above,or portions thereof, may be implemented using one or more computerdevices or systems, such as exemplary computer 170. The computer 170 mayinclude a processor 172, a memory 174, an input/output (I/O) interface176, and a Human Machine Interface (HMI) 178. The computer 170 may alsobe operatively coupled to one or more external resources 180 via thenetwork 182 or I/O interface 176. External resources may include, butare not limited to, servers, databases, mass storage devices, peripheraldevices, cloud-based network services, or any other resource that may beused by the computer 170.

The processor 172 may include one or more devices selected frommicroprocessors, micro-controllers, digital signal processors,microcomputers, central processing units, field programmable gatearrays, programmable logic devices, state machines, logic circuits,analog circuits, digital circuits, or any other devices that manipulatesignals (analog or digital) based on operational instructions that arestored in memory 174. Memory 174 may include a single memory device or aplurality of memory devices including, but not limited to, read-onlymemory (ROM), random access memory (RAM), volatile memory, non-volatilememory, static random access memory (SRAM), dynamic random access memory(DRAM), flash memory, cache memory, or data storage devices such as ahard drive, optical drive, tape drive, volatile or non-volatile solidstate device, or any other device capable of storing data.

The processor 172 may operate under the control of an operating system184 that resides in memory 174. The operating system 184 may managecomputer resources so that computer program code embodied as one or morecomputer software applications, such as an application 186 residing inmemory 174, may have instructions executed by the processor 172. In analternative embodiment, the processor 172 may execute the application186 directly, in which case the operating system 184 may be omitted. Oneor more data structures 188 may also reside in memory 174, and may beused by the processor 172, operating system 184, or application 186 tostore or manipulate data.

The I/O interface 176 may provide a machine interface that operativelycouples the processor 172 to other devices and systems, such as theexternal resource 180 or the network 182. The application 186 maythereby work cooperatively with the external resource 180 or network 182by communicating via the I/O interface 176 to provide the variousfeatures, functions, applications, processes, or modules comprisingembodiments of the invention. The application 186 may also have programcode that is executed by one or more external resources 180, orotherwise rely on functions or signals provided by other system ornetwork components external to the computer 170. Indeed, given thenearly endless hardware and software configurations possible, personshaving ordinary skill in the art will understand that embodiments of theinvention may include applications that are located externally to thecomputer 170, distributed among multiple computers or other externalresources 180, or provided by computing resources (hardware andsoftware) that are provided as a service over the network 182, such as acloud computing service.

The HMI 178 may be operatively coupled to the processor 172 of computer170 to allow a user to interact directly with the computer 170. The HMI178 may include video or alphanumeric displays, a touch screen, aspeaker, and any other suitable audio and visual indicators capable ofproviding data to the user. The HMI 178 may also include input devicesand controls such as an alphanumeric keyboard, a pointing device,keypads, pushbuttons, control knobs, microphones, etc., capable ofaccepting commands or input from the user and transmitting the enteredinput to the processor 172.

A database 190 may reside in memory 174, and may be used to collect andorganize data used by the various systems and modules described herein.The database 190 may include data and supporting data structures thatstore and organize the data. In particular, the database 190 may bearranged with any database organization or structure including, but notlimited to, a relational database, a hierarchical database, a networkdatabase, or combinations thereof. A database management system in theform of a computer software application executing as instructions on theprocessor 172 may be used to access the information or data stored inrecords of the database 190 in response to a query, which may bedynamically determined and executed by the operating system 184, otherapplications 186, or one or more modules.

In general, the routines executed to implement the embodiments of theinvention, whether implemented as part of an operating system or aspecific application, component, program, object, module or sequence ofinstructions, or a subset thereof, may be referred to herein as“computer program code,” or simply “program code.” Program codetypically comprises computer-readable instructions that are resident atvarious times in various memory and storage devices in a computer andthat, when read and executed by one or more processors in a computer,cause that computer to perform the operations necessary to executeoperations or elements embodying the various aspects of the embodimentsof the invention. Computer-readable program instructions for carryingout operations of the embodiments of the invention may be, for example,assembly language, source code, or object code written in anycombination of one or more programming languages.

Various program code described herein may be identified based upon theapplication within which it is implemented in specific embodiments ofthe invention. However, it should be appreciated that any particularprogram nomenclature which follows is used merely for convenience, andthus the invention should not be limited to use solely in any specificapplication identified or implied by such nomenclature. Furthermore,given the generally endless number of manners in which computer programsmay be organized into routines, procedures, methods, modules, objects,and the like, as well as the various manners in which programfunctionality may be allocated among various software layers that areresident within a typical computer (e.g., operating systems, libraries,API's, applications, applets, etc.), it should be appreciated that theembodiments of the invention are not limited to the specificorganization and allocation of program functionality described herein.

The program code embodied in any of the applications/modules describedherein is capable of being individually or collectively distributed as acomputer program product in a variety of different forms. In particular,the program code may be distributed using a computer-readable storagemedium having computer-readable program instructions thereon for causinga processor to carry out aspects of the embodiments of the invention.

Computer-readable storage media, which is inherently non-transitory, mayinclude volatile and non-volatile, and removable and non-removabletangible media implemented in any method or technology for storage ofdata, such as computer-readable instructions, data structures, programmodules, or other data. Computer-readable storage media may furtherinclude RAM, ROM, erasable programmable read-only memory (EPROM),electrically erasable programmable read-only memory (EEPROM), flashmemory or other solid state memory technology, portable compact discread-only memory (CD-ROM), or other optical storage, magnetic cassettes,magnetic tape, magnetic disk storage or other magnetic storage devices,or any other medium that can be used to store data and which can be readby a computer. A computer-readable storage medium should not beconstrued as transitory signals per se (e.g., radio waves or otherpropagating electromagnetic waves, electromagnetic waves propagatingthrough a transmission media such as a waveguide, or electrical signalstransmitted through a wire). Computer-readable program instructions maybe downloaded to a computer, another type of programmable dataprocessing apparatus, or another device from a computer-readable storagemedium or to an external computer or external storage device via anetwork.

Computer-readable program instructions stored in a computer-readablemedium may be used to direct a computer, other types of programmabledata processing apparatuses, or other devices to function in aparticular manner, such that the instructions stored in thecomputer-readable medium produce an article of manufacture includinginstructions that implement the functions, acts, or operations specifiedin the flow-charts, sequence diagrams, or block diagrams. The computerprogram instructions may be provided to one or more processors of ageneral purpose computer, a special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the one or more processors, cause aseries of computations to be performed to implement the functions, acts,or operations specified in the flow-charts, sequence diagrams, or blockdiagrams.

In certain alternative embodiments, the functions, acts, or operationsspecified in the flow-charts, sequence diagrams, or block diagrams maybe re-ordered, processed serially, or processed concurrently consistentwith embodiments of the invention. Moreover, any of the flow-charts,sequence diagrams, or block diagrams may include more or fewer blocksthan those illustrated consistent with embodiments of the invention.

It should be understood that the elements or features depicted by thedrawings are not necessarily to scale within each drawing or betweendrawings. The drawings may also emphasize, deemphasize, or omit certainelements in order to more clearly illustrate embodiments of theinvention and to help convey a clear understanding thereof.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the embodimentsof the invention. As used herein, the singular forms “a”, “an” and “the”are intended to include both the singular and plural forms, and theterms “and” and “or” are each intended to include both alternative andconjunctive combinations, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises” or“comprising,” when used in this specification, specify the presence ofstated features, integers, actions, steps, operations, elements, orcomponents, but do not preclude the presence or addition of one or moreother features, integers, actions, steps, operations, elements,components, or groups thereof. Furthermore, to the extent that the terms“includes”, “having”, “has”, “with”, “comprised of”, or variants thereofare used in either the detailed description or the claims, such termsare intended to be inclusive in a manner similar to the term“comprising”.

While all the invention has been illustrated by a description of variousembodiments, and while these embodiments have been described inconsiderable detail, it is not the intention of the Applicant torestrict or in any way limit the scope of the appended claims to suchdetail. Additional advantages and modifications will readily appear tothose skilled in the art. The invention in its broader aspects istherefore not limited to the specific details, representative apparatusand method, and illustrative examples shown and described. Accordingly,departures may be made from such details without departing from thespirit or scope of the Applicant's general inventive concept.

What is claimed is:
 1. A system, comprising: a first lighting devicecomprising: a first housing; a first processor, a first memory includingfirst program code, and a first transceiver supported by the firsthousing, the first housing including a first recessed portion and asecond recessed portion, the first lighting device further comprising: afirst solar panel including one or more photovoltaic or photoelectriccells supported in the first recessed portion of the first housing; afirst lens having a top surface, a bottom surface and at least one sidesurface extending between the top and bottom surfaces, the first lensbeing positioned to overlie the first solar panel; a first light sourcecomprising one or more light emitting diodes (LEDs) positioned relativeto the first recessed portion to transmit light emitted by the firstlight source to be incident on the at least one side surface of thefirst lens and be transmitted outward from the top surface of the firstlens; and a first cover made of optically translucent or transparentmaterial supported in the second recessed portion of the first housingand being positioned to overlie the first lens; a second lighting devicecomprising: a second housing; a second processor, a second memoryincluding second program code, and a second transceiver supported by thesecond housing, the second housing including a first recessed portionand a second recessed portion, the second lighting device furthercomprising: a second solar panel including one or more photovoltaic orphotoelectric cells supported in the first recessed portion of thesecond housing; a second lens having a top surface, a bottom surface andat least one side surface extending between the top and bottom surfaces,the second lens being positioned to overlie the second solar panel; asecond light source comprising one or more light emitting diodes (LEDs)positioned relative to the first recessed portion of the second housingto transmit light emitted by the second light source to be incident onthe at least one side surface of the second lens and be transmittedoutward from the top surface of the second lens; and a second cover madeof optically translucent or transparent material supported in the secondrecessed portion of the second housing and being positioned to overliethe second lens; wherein the first program code, when executed by thefirst processor, causes the first lighting device to: receive a firstsignal, and in response to receiving the first signal, activate thefirst light source and transmit a second signal, and wherein the secondprogram code, when executed by the second processor, causes the secondlighting device to: receive the second signal, and in response toreceiving the second signal, activate the second light source.
 2. Thesystem of claim 1, wherein the first program code further causes thefirst lighting device to: extract data from the first signal indicativeof an identity of a transmitting device; compare the identity of thetransmitting device to a list of authorized devices; and only activatethe first light source or transmit the second signal if the transmittingdevice is an authorized device.
 3. The system of claim 2, wherein thefirst program code further causes the first lighting device to: inresponse to the transmitting device not being an authorized device,enter a sleep mode.
 4. The system of claim 2, wherein the list ofauthorized devices defines a group of lighting devices that are allilluminated when any one of the lighting devices in the group areactivated.
 5. The system of claim 1, wherein the first program codefurther causes the first lighting device to: extract data from the firstsignal indicative of a characteristic of light to be emitted by thefirst light source; and cause the first light source to emit lighthaving the characteristic.
 6. The system of claim 1, wherein the firstprogram code further causes the first lighting device to: determine anambient light level; compare the ambient light level to a thresholdlight level; and only activate the first light source if the ambientlight level is less than the threshold light level.
 7. The system ofclaim 1, wherein the first program code further causes the firstlighting device to: in response to receiving the first signal, set alight timer; and in response to the light timer expiring, deactivate thefirst light source.
 8. The system of claim 7, wherein the first programcode further causes the first lighting device to: receive a thirdsignal; and in response to receiving the third signal, reset the lighttimer.
 9. The system of claim 1, wherein: the first light sourceincludes a first identifier, the first signal includes one or moreidentifiers that identify lighting devices that are to activate theirrespective light sources, and the first program code only causes thefirst lighting device to activate the first light source if the firstidentifier is one of the one or more identifiers included in the firstsignal.
 10. The system of claim 1, wherein the first and second lightsources are positioned in the respective first recessed portions of thefirst and second housings.
 11. The system of claim 1, wherein therespective first and second light sources are positioned in at least oneedge of the respective first recessed portions of the first and secondhousings.
 12. The system of claim 1, wherein each of the first andsecond lighting devices further comprises: at least one pressure sensorpositioned and configured to support the respective first and secondcovers.
 13. The system of claim 1, wherein each of the first and secondlighting devices comprises: an ambient sensor responsive to at least oneof an ambient light level, a sound level, movement, temperature, animage or video of an area in view of the respective first and secondlighting devices, and/or a transducer.
 14. The system of claim 1,wherein each of the first and second lighting devices comprises: a userinterface including at least one of a touch sensor, a pressure sensor, aswitch, a proximity sensor, a motion sensor, a microphone, a data port,and/or a speaker.
 15. A method comprising: receiving a first signal at afirst lighting device, the first lighting device comprising: a firsthousing; a first processor, a first memory including first program code,and a first transceiver supported by the first housing, the firsthousing including a first recessed portion and a second recessedportion, the first lighting device further comprising: a first solarpanel including one or more photovoltaic or photoelectric cellssupported in the first recessed portion of the first housing; a firstlens having a top surface, a bottom surface and at least one sidesurface extending between the top and bottom surfaces, the first lensbeing positioned to overlie the first solar panel; a first light sourcecomprising one or more light emitting diodes (LEDs) positioned relativeto the first recessed portion to transmit light emitted by the firstlight source to be incident on the at least one side surface of thefirst lens and be transmitted outward from the top surface of the firstlens or first cover; and a first cover made of optically translucent ortransparent material supported in the second recessed portion of thefirst housing and being positioned to overlie the first lens: inresponse to receiving the first signal, the first lighting deviceactivating the first light source and transmitting a second signal;receiving the second signal at a second lighting device, the secondlighting device comprising: a second housing; a second processor, asecond memory including second program code, and a second transceiversupported by the second housing, the second housing including a firstrecessed portion and a second recessed portion, the second lightingdevice further comprising: a second solar panel including one or morephotovoltaic or photoelectric cells supported in the first recessedportion of the second housing; a second lens having a top surface, abottom surface and at least one side surface extending between the topand bottom surfaces, the second lens being positioned to overlie thesecond solar panel; a second light source comprising one or more lightemitting diodes (LEDs) positioned relative to the first recessed portionof the second housing to transmit light emitted by the second lightsource to be incident on the at least one side surface of the secondlens and be transmitted outward from the top surface of the second lens;and a second cover made of optically translucent or transparent materialsupported in the second recessed portion of the second housing and beingpositioned to overlie the second lens; and in response to receiving thesecond signal, the second lighting device activating the second lightsource.
 16. The method of claim 15, further comprising: extracting datafrom the first signal indicative of an identity of a transmittingdevice; comparing the identity of the transmitting device to a list ofauthorized devices; and only activating the first light source ortransmitting the second signal if the transmitting device is anauthorized device.
 17. The method of claim 16, further comprising: inresponse to the transmitting device not being an authorized device,causing the first lighting device to enter a sleep mode.
 18. The methodof claim 16, wherein the list of authorized devices defines a group oflighting devices that are all illuminated when any one of the lightingdevices in the group are activated.
 19. The method claim 15, furthercomprising: extracting data from the first signal indicative of acharacteristic of light to be emitted by the first light source; andcausing the first light source to emit light having the characteristic.20. The method of claim 15, further comprising: determining an ambientlight level at the first lighting device; comparing the ambient lightlevel to a threshold light level; and only activating the first lightsource if the ambient light level is less than the threshold lightlevel.
 21. The method of claim 15, further comprising: in response toreceiving the first signal, setting a light timer; and in response tothe light timer expiring, deactivating the first light source.
 22. Themethod of claim 21, further comprising: receiving a third signal at thefirst lighting device; and in response to receiving the third signal,resetting the light timer.
 23. The method of claim 15, wherein: thefirst light source includes a first identifier, the first signalincludes one or more identifiers that identify lighting devices that areto activate their respective light sources, and only activating thefirst light source if the first identifier is one of the one or moreidentifiers included in the first signal.
 24. The method of claim 15,wherein the first signal is received from a user interface of the firstlighting device or as a wireless signal transmitted from a deviceexternal to the first lighting device.
 25. A computer program productcomprising: a non-transitory computer-readable storage medium; andprogram code stored on the non-transitory computer-readable storagemedium that, when executed by one or more processors, causes the one ormore processors to: receive a first signal at a first lighting device,the first lighting device comprising: a first housing; a firstprocessor, a first memory including first program code, and a firsttransceiver supported by the first housing, the first housing includinga first recessed portion and a second recessed portion, the firstlighting device further comprising: a first solar panel including one ormore photovoltaic or photoelectric cells supported in the first recessedportion of the first housing; a first lens having a top surface, and abottom surface and at least one side surface extending between the topand bottom surfaces, the first lens being positioned to overlie thefirst solar panel; a first light source comprising one or more lightemitting diodes (LEDs) positioned relative to the first recessed portionto transmit light emitted by the first light source to be incident onthe at least one side surface of the first lens and be transmittedoutward from the top surface of the first lens; and a first cover madeof optically translucent or transparent material supported in the secondrecessed portion of the first housing and being positioned to overliethe first lens; in response to receiving the first signal, activate thefirst light source and transmit a second signal from the first lightingdevice; receive the second signal at a second lighting device, thesecond lighting device comprising: a second housing; a second processor,a second memory including second program code, and a second transceiversupported by the second housing, the second housing including a firstrecessed portion and a second recessed portion, the second lightingdevice further comprising: a second solar panel including one or morephotovoltaic or photoelectric cells supported in the first recessedportion of the second housing; a second lens having a top surface, abottom surface and at least one side surface extending between the topand bottom surfaces, the second lens being positioned to overlie thesecond solar panel; a second light source comprising one or more lightemitting diodes (LEDs) positioned relative to the first recessed portionof the second housing to transmit light emitted by the second lightsource to be incident on the at least one side surface of the secondlens and be transmitted outward from the top surface of the second lens;and a second cover made of optically translucent or transparent materialsupported in the second recessed portion of the second housing and beingpositioned to overlie the second lens; and in response to receiving thesecond signal, activate the second light source.